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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 6    December 2002

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Differences of transformation behavior between Ni-rich TiNi shape memory films and alloys
HE Zhi-rong (贺志荣)1 , 2, ZHOU Jing-en (周敬恩)1

1. State Key Laboratory for Mechanical Behavior of Materials, Xi′an Jiaotong University,Xi′an 710049, China;
2. Department of Materials Science and Engineering, 
Shaanxi University of Technology,Hanzhong 723003, China

Abstract:The differences of transformation behavior between Ni-rich TiNi shape memory film (SMF) and shape memory alloy (SMA) age-treated at 773K after solutiontreatment at 973K have been investigated, using Ti51.5Ni thin film and Ti-51.5Ni bulk alloy as examples, by differential scanning calorimetry (DSC), SEM and EDX. It is found that the age-treated Ni-rich TiNi SMF and SMA are of the same types of transformation, i.e., ARM(during cooling), and MA (during heating) (A: parent phase; R: R-phase; M: martensite); the transformation temperature of the TiNi SMF is lower than that of the SMA, but the SMFs hysteresis is larger. The transformation heat of the TiNi SMF and SMA is nearly the same. The reason that TiNi SMFs strain is sensitive to temperature is not hysteresis, but its thickness is thinner, and the temperature is easy to distribute homogeneously.

 

Key words:  TiNi thin film; TiNi alloy; shape memory film; shape memory alloy; transformation temperature; transformation heat; temperature hysteresis

ISSN 1672-7029
CN 43-1423/U

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